<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    
</body>
</html>
<script>
    var a=Number(prompt('请输入一个整数'));
	if(a%2===0){
		alert(a+'是偶数');
	}else{
		alert(a+'不是整数');
	}
</script>